01 - Cook the elbow macaroni in salted boiling water until al dente according to package directions. Drain thoroughly and set aside.
02 - Melt 1 tablespoon butter in a medium saucepan over medium heat. Whisk in the flour and cook for 1 minute, stirring constantly to form a smooth paste.
03 - Gradually whisk in the whole milk, stirring continuously until the mixture thickens and bubbles, approximately 2 minutes. Remove from heat.
04 - Stir in the shredded cheddar cheese until fully melted and smooth. Season with salt, black pepper, and paprika. Add the cooked macaroni and mix well. Allow to cool slightly.
05 - Place a tortilla on a flat surface. Spread one-quarter of the mac and cheese mixture over half the tortilla. Sprinkle with 2 tablespoons Monterey Jack cheese. Fold the tortilla in half. Repeat with remaining tortillas.
06 - Heat a large skillet or griddle over medium heat. Melt a small amount of butter and cook each quesadilla for 2 to 3 minutes per side until golden brown and crispy, pressing gently with a spatula.
07 - Transfer quesadillas to a cutting board. Let cool for 1 minute before cutting into wedges. Serve immediately.